house, we go to abc's jonathan karl here. Tell me exactly where it stands in hard numbers. The race is basically tied. Virtually tied in every battleground sa state. This vase a coin toss, diane, just like the last three campaigns going into the convention with a race with this tie. Seems to be the way of politics these days. And they're supposed to come out with a change in that. A balance of how much? Average is about seven points. They are counting on a bounce. They want a big bounce out of this convention. They want to leave here with a lead and they think they can. Almost 40,000 people have watched these speeches in the past. It makes a big difference what happens on that stage in the next three days. This is the one chance to get the attention of the country to introduce mitt romney. This is who mitt romney is. How much is it going to change the dynamic of this all? They're full speed ahead. They've got contingency plans to change things. But they're full speed ahead. They're, of course, competing for attention. Well, you know what, they can't control the weather. Jon will be here. After break coming up after the break on "world news" --

This transcript has been automatically generated and may not be 100% accurate.

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